prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -o main.o -c main.cpp 
main.cpp: In function 'int main(int, char**)':
main.cpp:208:31: warning: 'prior' may be used uninitialized in this function [-Wmaybe-uninitialized]
                 prior->enqueue(*point);
                 ~~~~~~~~~~~~~~^~~~~~~~
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully